/Engine/Source/Runtime/AIModule/Classes/BehaviorTree/BTService.h
Called when search enters underlying branch this function should be considered as const (don't modify state of object) if node is not instanced! bNotifyOnSearch must be set to true for this function to be called Calling INIT_SERVICE_NODE_NOTIFY_FLAGS in the constructor of the service will set this flag automatically
virtual void OnSearchStart ( [FBehaviorTreeSearchData](API\Runtime\AIModule\BehaviorTree\FBehaviorTreeSearchData) & SearchData )